Automatically operable lubricating pump



Nov. 30, 1965 A. STIHL ETAL AUTOMATICALLY OPERABLE LUBRICATING PUMP Original Filed Sept. 18, 1959 a A. 6 2 1 67 53 NM INVENTORS. HNDREHS TIHL BY HERMfl/VA/ HAJE' 9 77 Fig. 3

United States Patent 3,220,271 AUTOMATICALLY OPERABLE LUBRICATING PUMP Andreas Stihl, Badstrasse 169, Neustadt, near Waiblingen, Germany, and Hermann Hiise, Stuttgart-Bad Cannstatt, Germany; said Hiise assignor to said Stihl Original application Sept. 18, 1959, Ser. No. 840,850, new Patent No. 3,068,961, dated Dec. 18, 1962. Divided and this application Sept. 17, 1962, Ser. No. 223,972 Claims priority, application Germany, Sept. 19, 1958, St 14,259 3 Claims. (Cl. 74-128) This invention relates to a drive arrangement and is particularly concerned with an intermittent one-way drive arrangement especially adapted for the driving of a rotary and reciprocatory pump piston or the like. This application is a division of my co-pending application Ser. No. 840,850, filed Sept. 18, 1959, and entitled Automatically Operable Lubricating Pump, Especially for Motor Chain Saws, now Patent No. 3,068,961.

In my prior application, above referred to, I show a chain saw driven by an engine with a lubricating pump being provided that has a plunger that is driven in rotation and reciprocation. The pump supplies lubricant to the saw and is driven by a reciprocating drive member that is connected to a diaphragm that is subjected to the variations in pressure in the engine crank case, or in the engine manifold. It is in particular connection with the drive arrangement interconnecting the said reciprocating drive member and the pump plunger that the present invention is c-oncernexl.

With the foregoing in mind, a primary object of the present invention is the provision of a one-way drive arrangement which will convert reciprocatory motion of a drive element into rotary motion of a driven element.

Another object is the provision of a one-way drive arrangement for converting reciprocatory motion of a drive element into rotary motion of a driven element while simultaneously the said driven element is caused to reciprocate.

Another object of the present invention is the provision of an extremely simple and inexpensive one-way drive arrangement of the nature referred to.

Still another object of this invention is the provision of an extremely compact one-way drive arrangement which can readily be incorporated in other structures for accomplishing a one-way driving action.

It is also an object of this invention to provide a oneway driving arrangement of the nature referred to which can operate extremely rapidly so that the arrangement can be made sensitive to the rapid pulses that occur in the crank case or the manifold of an internal combustion engine, particularly an engine of the two stroke cycle type.

The foregoing objects as well as other objects and advantages of the present invention will be more clearly apparent from the following specification taken in connection with the accompanying drawings, in which:

FIGURE 1 is a vertical sectional view taken through a one-way drive arrangement according to the present invention and is indicated by line 1-1 on FIGURE 2.

FIGURE 2 is a transverse section taken through the device according to the present invention and is indicated by line 22 on FIGURE 1.

FIGURE 3 is a fragmentary section indicated by line 33 on FIGURE 2 showing the arrangement for imp-arting reciprocation to the driven member in response to the rotation thereof.

General arrangement According to the present invention, a drive member is caused to reciprocate or oscillate by any suitable means 3,220,271 Patented Nov. 30, I965 "ice such as a diaphragm subjected to pulsating pressure, or by a cam, or in any other manner.

The drive member has for its purpose to impart rotation upon the driven member. According to the present invention the reciprocating drive member is connected to the driven member by way of a one-Way drive clutch so that in one direction of movement of the drive member a positive drive into the driven member is eifected while in the other direction of movement of the reciprocating drive member the said positive drive connection is interrupted.

Associated with the driven member is a one-Way brake which is ineffective when the driving member is moving in its driving direction so that it does not impede the movement of the driven member, while in the other direction of movement of the reciprocating member, the oneway brake positively prevents movement of the rotary driven member in the direction opposite to its driven direction whereby reciprocation of the driving member results in intermittent rotary movement of the driven member.

According to this invention the driven member may also be reciprocated and this can be accomplished by a cam arrangement operable in response to rotation of the driven member. The clutch and brake arrangement of the present invention is so arranged that it does not inhibit the reciprocatory movement of the driven member so that, according to the present invention, both rotation and reciprocation of the driven member can take place at one and the same time.

Structural arrangement Referring now to the drawings somewhat more in detail, there is shown in the drawings a housing 1 and attached thereto is a cover plate member 2. Gasket means 3 constituting a diaphragm may be interposed between housing 1 and cover plate 2 and the diaphragm encloses a recess 1a in the housing and an opposing recess 2a in the cover plate. The cover plate and housing are secured by any suitable means.

One of the aforementioned recesses is adapted for being subjected to a pulsating pressure via a conduit 4 which may lead to a manifold or the crank case of an internal combustion engine, particularly, a two stroke cycle engine. The pressure pulsations are indicated by the double ended arrow F1 in FIGURE 1.

Reciprocably mounted in housing 1 is a reciprocatory drive member 5. This member at its one end is secured to diaphragm 3 as by the discs 5a which embrace the diaphragm on opposite sides and through which a reduced diameter portion of plunger 5 extends to be riveted over as illustrated in FIGURE 1.

The variations in pressure supplied to the diaphragm through conduit 4 results in reciprocation of drive member 5 in casing 1 as indicated by arrow F2 on FIGURE 1. It will be understood at this point that the diaphragm 3 itself could be a relatively stiff resilient member, or the plunger 5 could be biased in one direction or toward a certain position by suitable spring means so that a pulsing pressure would effect the aforementioned reciprocation.

Near the end of plunger 5 opposite its connection to diaphragm 3, the said plunger is provided with a lateral notch 6. This lateral notch 6 is disposed Within a recess 6a in housing 1 and disposed within lateral notch 6 is a cam like drive finger 7 integral with a drive ring 8 pertaining to a one-way dn've clutch. The recess 6a provides adequate space for the drive finger 6 to move as plunger 5 reciprocates.

Drive ring 8 is mounted in co-axial relation to a driven member 9 which, in the drawings, takes the form of a rotary and reciprocatory plunger.

Plunger 9 has associated therewith a second ring encircling the plunger in co-axial relation thereto and on one side of ring 8. Ring 10 forms a one-way brake for plunger 9 as has been referred to previously.

The rings 8 and 10 are mounted on plunger 9 between a first ring 10a secured to plunger 9 and a second ring 11 that is retained on plunger 9 by a snap ring 12. Antifriction discs 11a are preferably disposed on opposite sides of ring 8.

It has been mentioned taht ring 10 is a brake ring and to this end ring 16 has integral therewith a finger or lug portion 13 that engages a correspondingly shaped recess in housing 1, as will be seen in FIGURE 1, whereby ring 10 is prevented from rotating in housing 1. The engagement of the lug 13 with the recess however, permits some shifting of ring 19 within the housing in order to accommodate for slight manufacturing irregularities so that there will be no binding of ring 10 in the housing or on plunger 9.

Each of the aforementioned rings have a one-way driving connection with plunger 9 by virtue of an arrangement best indicated in FIGURE 1. In this arrangement, which can be identical for both of rings 8 and 10, there will be seen a plurality of rollers 14 which will be seen to be disposed between the circular interior surface of ring 10 and the inclined surfaces 14a formed on plunger 9. Each roller has associated therewith a light compression spring 15 urging the roller in the direction toward which the aforementioned surfaces converge. In the arrangement illustrated in FIGURE 1, which pertains to ring 10, plunger 9 is free to rotate in the direction of the arrow F3 with no hindrance from rollers 14 because the said rotation of plunger 9 will cause the springs 15 to yield and permit the rollers to free themselves from wedging engagement between plunger 9 and ring 10. However, any attempt to rotate plunger 9 in a direction opposite to arrow F3 will result in the wedging of the rollers between the surfaces referred to and the plunger 9 will be positively prevented from rotating in the said direction.

The ring 9 has associated therewith the same rollerspring arrangement above described and it will be evident that, in the case of ring 8, upward movement of drive plunger 5, as it is viewed in FIGURE 1, will result in rotation of ring 8 in the direction of arrow F3. This will cause the rollers 14 pertaining to ring 8 to wedge against the above described outwardly inclined drive surfaces on plunger 9 and to drive plunger 9 in the direction of arrow F3 which movement of plunger 9, as previously mentioned is not inhibited by the brake of which ring 10 forms a part. The idle return movement of drive member 5 in the downward direction is of course, accompanied by idle return movement of ring 8 at which time the rollers 14 associated therewith do not drive plunger 9 but the plunger is instead, locked against rotation in this direction by the brake of which ring 10 forms a part.

It has been previously mentioned that it might be desired to reciprocate plunger 9 simultaneously with the rotation thereof and this can be accomplished by stationarily mounting a drive pin 16 adjacent plunger 9 and forming plunger 9 with an annular cam surface 17 engaging the pin so that as the plunger rotates it will also reciprocate.

This combination of rotation and reciprocation could be availed of for pumping fluids such as oil, for example, for lubricating machine parts.

In the drawings the end of plunger 9 opposite the end carrying cam surface 17 is notched as at 18 and is disposed in a closed cylinder 18a. An inlet conduit 19 leads into cylinder 18a and a discharge conduit 20 leads therefrom.

In operation, when notch 18 is disposed in communication with conduit 19 plunger 9 is caused to move in the downward direction, as is viewed in FIGURE 2, during its rotation and this will draw liquid into cylinder 18a from conduit 19. At the conclusion of the downward movement of plunger 9, the notchv 18 is moved so that the conduit 19 is closed otf while conduit 20 is caused to communicate with notch 18 and the plunger 9 then moves upwardly and discharges from cylinder 18a into conduit 20 the fluid previously drawn into the said cylinder from conduit 19.

The described arrangement is extremely compact and simple and inexpensive and can readily be incorporated in a machine for the purpose of pumping lubricants or the like.

Plunger 5 has been shown as being actuated by a flexible diaphragm subjected to pressure pulsations but it will be understood that this plunger could be operated by a cam, or by an oscillatory member or in any other way to producereciprocation of the drive member.

It will be noted, particularly in FIGURE 2, that the entire plunger and the drive arrangement associated therewith, with the exception of drive plunger 5, is free to reciprocate under the influence of pin 16 and cam surface 17 without interfering with the operation of the one-way drive and brake arrangement of the present invention.

It will also be apparent that the arrangement wherein the clutch and brake is completely enclosed within a housing, it is merely one way of constructing the device and that the clutch and brake could be exposed so long as the ring of the clutch was oscillated and the ring of the brake was held against rotation. The drive arrangement according to the present invention is thus adapted for use in many difierent circumstances.

It will further be understood that stop means could be provided for controlling the amount of reciprocation from the plunger 5 so that any desired amount of movement could be imparted to ring 8. Still further, the discs 5a could have disposed on opposite sides thereof a resilient rubber like rings 5b forming cushions to cushion the movement of drive plunger 5 whereby, even rapid reciprocation of the drive plunger would not be accompanied by any shock and the device would remain smooth running and quiet running at all times.

It will further be appreciated that the diaphragm could be operated by either over pressure or under pressure and that it could be applied to either side thereof.

It will be understood that the present invention is by means limited to the particular construction illustrated but comprise any modification within the scope of the appended claim and it is desired for such modifications to be comprehended within the purview of the present invention.

What is claimed is:

1. In a one-way drive arrangement; a frame having a bore, a driven member in the form of a plunger reciprocable and rotatable in said bore, a driving member in the frame adjacent said bore in the form of a reciprocating element, elements of a one-way drive clutch mounted on said driven member and drivingly connecting said driving member with said driven member, and elements of a one-way brake mounted on said driven member and interconnecting said driven member with said frame, said brake being ineffective in the driving direction of said clutch and effective in the opposite direction, the connection of said clutch with said driving member and of said brake with said frame permitting reciprocation of said brake and clutch with said plunger in said frame, and means connected between the plunger and the frame to cause reciprocation of the plunger in said bore in timed relation to the rotation of the plunger in the bore.

2. In a one-way drive arrangement; a frame having a bore, a driven member in the form of a plunger reciprocable and rotatable in the bore, a driving member in the form of a reciprocatory element in the frame extending substantially at right angles to said plunger and offset laterally therefrom, elements of a one-way clutch surrounding said driven member and including a drive portion having a connection with said drive member so that reciprocation of the drive member will drive said driven member in one direction, and elements of a one-way brake surrounding said driven member operable to prevent rotation of said member in the opposite direction, said brake including a connection with said frame, the connection of said drive portion with said drive member and of said brake with said frame being in the form of slots in said drive member and frame extending in the direction of reciprocation of said plunger in said bore, and means connected between the plunger and the frame to cause reciprocation of the plunger in said bore in timed relation to the rotation of the plunger in the bore.

3. A one-Way drive arrangement according to claim 1 which includes a diaphragm connected to said driving member, a chamber in the frame of which said diaphragm forms a wall, and means for varying the pressure in said chamber to effect reciprocation of said driving member.

References Cited by the Examiner UNITED STATES PATENTS 1,985,406 12/1934 Galkin 74-126 2,070,203 2/1927 Gregg 103157 2,612,140 9/1952 Miller 9285 2,713,850 7/1955 Bradbury et al 192-91 3,000,232 9/1961 Gena 74-531 3,022,680 2/1962 Van Roojen 19212 X BROUGHTON G. DURHAM, Primary Examiner. 

1. IN A ONE-WAY DRIVE ARRANGEMENT; A FRAME HAVING A BORE, A DRIVEN MEMBER IN THE FORM OF A PLUNGER RECIPROCABLE AND ROTATABLE IN SAID BORE, A DRIVING MEMBER IN THE FRAME ADJACENT SAID BORE IN THE FORM OF A RECIPROCATING ELEMENT, ELEMENTS OF A ONE-WAY DRIVE CLUTCH MOUNTED ON SAID DRIVEN MEMBER AND DRIVINGLY CONNECTING SAID DRIVING MEMBER WITH SAID DRIVEN MEMBER, AND ELEMENTS OF A ONE-WAY BRAKE MOUNTED ON SAID DRIVEN MEMBER AND INTERCONNECTING SAID DRIVEN MEMBER WITH SAID FRAME, SAID BRAKE BEING INEFFECTIVE IN THE DRIVING DIRECTION OF SAID CLUTCH AND EFFECTIVE IN THE OPPOSITE DIRECTION, THE CONNECTION OF SAID CLUTCH WITH SAID DRIVING MEMBER AND OF SAID BRAKE WITH SAID FRAME PERMITTING RECIPROCATION OF SAID BRAKE AND CLUTCH WITH SAID PLUNGER IN SAID FRAME, AND MEANS CONNECTED BETWEEN THE PLUNGER AND THE FRAME TO CAUSE RECIPROCATION OF THE PLUNGER IN SAID BORE IN TIMED RELATION TO THE ROTATION OF THE PLUNGER IN THE BORE. 